Question by skylerkingdev · Oct 25, 2012 at 05:31 AM · ios rotate smooth accelerometer

How to rotate your device and counter rotate camera

I'm looking to use accelerometer input to influence game objects, but counter rotate the camera so the scene always stays flat on the horizon. Sort of like asphalt7 and real racing. I have tried a few things but they are all so jittery that it seems like I have frame rate issues. I found this out on the forums somewhere and it gets pretty close but is still not smooth enough.

 function Update () {
 
 var finalAngle = Input.acceleration.y*90;
 
 transform.localEulerAngles.z = finalAngle;
 
 }

Is there a better way to go about this? Or how would one go about smoothing the above enough to make things look good?

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prototype7 · Oct 25, 2012 at 06:09 AM 0

did you try use smooth damp ?

 fuction Update(){
     var finalAngle = Input.acceleration.y * 90;
     var smoothTime : float = 0.3F;
     private var myVelocity : float = 0.0F;
     
     var newPosition : float = $$anonymous$$athf.SmoothDamp(transform.localEulerAngles.z, finalAngle, myVelocity, smoothTime);
     transform.localEulerAngles = Vector3(transform.localEulerAngles.x, transform.localEulerAngles.y, newPosition);
 }

skylerkingdev · Oct 25, 2012 at 11:55 PM 0

Thank you for the reply. The issue that I am running into with that is the camera is rolling completely over. Like a barrel roll. Im trying to limit it. It is strange because it only does that when I tilt to the left.. the right is fine. The smooth damp does help it out as far as animation goes. It looks really nice in motion. It seems like when the z rotation hits 0 it rolls completely over. Hmm.

skylerkingdev · Oct 26, 2012 at 02:40 AM 0

Okay, I have a pretty good solution for getting this working, but I'm not sure the smooth damp is working at all. Have a look at this

var myVelocity : float = 0.0F;

var lookSmoothDamp : float = .3;

function Update () {

 var finalAngle = Input.acceleration.x*40*-1;

 var cameraRotation = $$anonymous$$athf.SmoothDamp(maincamera.transform.rotation.z, finalAngle, myVelocity, lookSmoothDamp);

 

 if(finalAngle < 20 && finalAngle > -20) {

 maincamera.transform.localEulerAngles.z = cameraRotation;

 }

}

prototype7 · Oct 27, 2012 at 12:01 AM 0

You can try put in your code inside LateUpdate, that will track your object more precisely